3175 North over Big Lost River
FairButte County, Idaho · 0.2 N. 0.4 E. Moore · Structure no. 000000000031435
- Built
- 1935
- 90 years old, rebuilt 1989
- Condition
- Fair
- inspected July 2023
- Type
- Tee Beam
- Prestressed Concrete
- Length
- 38 ft
- 1 main span
- Daily traffic
- 210
- 2023 count
- Owner
- County
- County Highway Agency
About this bridge
3175 North over Big Lost River is a prestressed concrete tee beam carrying 3175 North over Big Lost River in Butte County, Idaho. It was built in 1935 and reconstructed in 1989, so it is 90 years old, older than the Idaho average of 45.3 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
It carries about 210 vehicles a day, roughly 11% of them trucks, projected to reach 315 by 2042. The structure is 38 ft (11.6 m) long and 25 ft wide. If it were closed, the detour would be 0.6 mi (1 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was 3175 North over Big Lost River built?
It was built in 1935, making it 90 years old in 2025. It was reconstructed in 1989.
What condition is 3175 North over Big Lost River in?
The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in July 2023.
How much traffic does 3175 North over Big Lost River carry?
About 210 vehicles per day (2023 count), of which roughly 11% are trucks.
How long is 3175 North over Big Lost River?
The structure is 38 ft (11.6 m) long with a longest span of 36 ft (11 m) and a deck 25 ft wide.
Who owns 3175 North over Big Lost River?
It is owned by the County Highway Agency.